[patch] mISDN: fix reversed if in st_own_ctrl()

[Dan Carpenter]

The current code probably returns -EINVAL a lot.  Otherwise it would oops.

Compile tested only.  Found by smatch (http://repo.or.cz/w/smatch.git).

regards,
dan carpenter

Signed-off-by: Dan Carpenter <error27@xxxxxxxxx>

--- orig/drivers/isdn/mISDN/stack.c	2009-07-17 13:34:57.000000000 +0300
+++ new/drivers/isdn/mISDN/stack.c	2009-07-17 13:35:32.000000000 +0300
@@ -364,7 +364,7 @@
 static int
 st_own_ctrl(struct mISDNchannel *ch, u_int cmd, void *arg)
 {
-	if (!ch->st || ch->st->layer1)
+	if (!ch->st || !ch->st->layer1)
 		return -EINVAL;
 	return ch->st->layer1->ctrl(ch->st->layer1, cmd, arg);
 }
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